BLENDER RIGIFY ERROR (Generation has thrown an exception: 'bpy_prop_collection[key]: key "ear.L.004" not found')
I saw your file. The ear bone is there but it was not un-parented from the other bones for some reason
You have to parent

ear.L.004 to ear.L.003
ear.R.004 to ear.R.003

Parent with Connected.
Also your metarig has Scale that has not been applied so most likely you'll have to press CTRL+A &gt; Scale (in Object Mode!)